Introduction to software development methodologies- Agile vs Waterfall


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Introduction to software development methodologies- Agile vs Waterfall

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Introduction to software development methodologies- Agile vs Waterfall

  1. 1. -Prateek Shrivastava 14 years of s/w development experience PMI-PMP, PMI-ACP, CSM, CSP © Prateek Shrivastava 2013 1
  2. 2.  Some important definitions  Different methodologies/processes  Waterfall  Agile  Role and Responsibilities  What is right for your project? © Prateek Shrivastava 2013 2
  3. 3.  Project: ◦ Is a temporary endeavor with a beginning and an end. ◦ Creates a unique product, service or a result  Software development methodology: ◦ Software development methodology is the set of activities and processes (what) that will eventually result in a software product. ◦ It also describes tools and techniques (how) and important role (who) in the development process. © Prateek Shrivastava 2013 3
  4. 4. There are multiple ways to build a software…  Ad hoc  Waterfall  Prototyping  Spiral  Iterative  Agile © Prateek Shrivastava 2013 4
  5. 5. Analysis Design Requirements Development Testing Delivery © Prateek Shrivastava 2013 5
  7. 7. © Prateek Shrivastava 2013 7 Manifesto for Agile Software Development  Individuals and interactions over processes and tools  Working software over comprehensive documentation  Customer collaboration over contract negotiation  Responding to change over following a plan That is, while there is value in the items on the right, we value the items on the left more. We are uncovering better ways of developing software by doing it and helping others do it. Through this work we have come to value: Kent Beck Mike Beedle Arie van Bennekum Alistair Cockburn Ward Cunningham Martin Fowler James Grenning Jim Highsmith Andrew Hunt Ron Jeffries Jon Kern Brian Marick Robert C. Martin Steve Mellor Ken Schwaber Jeff Sutherland Dave Thomas
  8. 8. © Prateek Shrivastava 2013 8 1. Our highest priority is to satisfy the customer through early and continuous delivery of valuable software. 2. Welcome changing requirements, even late in development. Agile processes harness change for the customer's competitive advantage. 3. Deliver working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale. 4. Business people and developers must work together daily throughout the project. 5. Build projects around motivated individuals. Give them the environment and support they need, and trust them to get the job done. 6. The most efficient and effective method of conveying information to and within a development team is face-to-face conversation. 7. Working software is the primary measure of progress. 8. Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely. 9. Continuous attention to technical excellence and good design enhances agility. 10. Simplicity--the art of maximizing the amount of work not done--is essential. 11. The best architectures, requirements, and designs emerge from self-organizing teams. 12. At regular intervals, the team reflects on how to become more effective, then tunes and adjusts its behavior accordingly.
  9. 9. © Prateek Shrivastava 2013 9
  10. 10. Scope CostTime Quality Time Cost Scope Quality Fixed Fixed Traditional Iron Triangle Agile Inverted Triangle © Prateek Shrivastava 2013 10
  11. 11. Waterfall Agile Focuses on resource utilization Focuses on value generated Dictates process to team Facilitate the team defining the process. Helps Scrum Master Manager Coach Determines project schedule Helps team understand estimation process and team does the estimation/scheduling Command and Control Servant Leadership © Prateek Shrivastava 2013 11
  12. 12. Waterfall Agile Black-box testing Black-box and white-box testing Testing starts post development Works alongside development team. Development and testing goes hand-in-hand. Separate team reporting to QA manager Part of single Agile team reporting to same manager No focus on automation Focuses primarily on automation © Prateek Shrivastava 2013 12
  13. 13. Waterfall Agile Very skilled developer focusing on only one module Highly motivated individual working on all modules No collective code ownership Collective code ownership Lot of design documents (HLD, LLD) Light-weight design and working code No interaction with QA team QA and Dev work together Part of separate team reporting to development manager QA and Development part of same Agile team © Prateek Shrivastava 2013 13
  14. 14.  Apply these criterias.. ◦ Requirements  Stable or Changing? ◦ Experience  How comfortable team is to Technology and Process to be used? ◦ Scale of project  Large scale project distributed in multiple geographies? ◦ Customer involvement  Do they work closely with team? ◦ Regulatory requirement:  Can we reduce documentation at each stage? ◦ Contract types:  Fixed Price/Fixed Scope  Time and Material (T&M)  Money for Nothing, Change for Free (Agile) © Prateek Shrivastava 2013 14
  15. 15.  msc838p/Process/waterfall.pdf   s/agile-project-management © Prateek Shrivastava 2013 15
  16. 16. © Prateek Shrivastava 2013 16